1 Correct answer
It's not exactly an aspect ratio calculator, but you might not know that in InDesign you can enter math formulas into any box that requires sizes or positions: i.e., if you enter "2.5in x 3" you'll get a 7.5in object or XY position depending upon where you enter the math.
It could help if you're trying to do a ratio of something; if something needs to be 1/3 of something else, you could enter its size and then *.333 (i.e., if something had an X position on the page of 0.4582 in, if you entered 0.
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Replies
Thanks Buck. Yes, I know about that and I use that feature all the time.
I just spent a few weeks working on a new website so I think I may be stuck on aspect ratios because of that. 
Anyway, I ended up using image sizes that fit the page format of the brochure instead. Thanks for your help.
Hi @siobhan74 , This thread is from 2017, but a selection’s aspect ratio could be adjusted via a script. This asks for the desired AR, and adjusts either the selection’s width or height. If you select an image it will be scaled to the AR, if you select the parent frame there will be no scaling:
var s = app.activeDocument.selection[0]
main()
function main(){
if (s.constructor.name == "Rectangle" || s.constructor.name == "Image" || s.constructor.name == "EPS") {
makeDialog();
} else {
alert("Please Select a Placed Object or Rectangle")
return
}
}
var w, h, wr, hr;
function makeDialog(){
var theDialog = app.dialogs.add({name:"Enter an Aspect ratio", canCancel:true});
with(theDialog){
with(dialogColumns.add()){
with(dialogRows.add()){
staticTexts.add({staticLabel:"Aspect Ratio: "});
w = realEditboxes.add({editValue:4});
staticTexts.add({staticLabel:": "});
h = realEditboxes.add({editValue:3});
}
with(dialogRows.add()){
with(dialogColumns.add()){
with(radiobuttonGroups.add()){
wr = radiobuttonControls.add({checkedState:true});
hr = radiobuttonControls.add({checkedState:false});
}
}
with(dialogColumns.add()){
staticTexts.add({staticLabel:"Adjust Width: ", staticAlignment:StaticAlignmentOptions.LEFT_ALIGN, minWidth: 150});
staticTexts.add({staticLabel:"Adjust Height: ", staticAlignment:StaticAlignmentOptions.LEFT_ALIGN, minWidth: 150});
}
}
}
}
if(theDialog.show() == true){
w = w.editValue
h = h.editValue
wr = wr.checkedState
setAR()
theDialog.destroy();
}
}
function setAR(){
var r
var b = s.geometricBounds
var sw = b[3]-b[1];
var sh = b[2]-b[0]
if (wr) {
r = w/h;
s.geometricBounds = [b[0], b[1], b[2], b[1]+(sh*r)]
} else {
r = h/w
s.geometricBounds = [b[0], b[1], b[0]+(sw*r), b[3]]
}
}
Dialog looks like this:
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